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https://github.com/torvalds/linux
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1b3d4200c1
PCI BARs tell us whether prefetching is safe, but they don't say
anything about write combining (WC). WC changes ordering rules
and allows writes to be collapsed, so it's not safe in general
to use it on a prefetchable region.
Add pci_iomap_wc() and pci_iomap_wc_range() so drivers can take
advantage of write combining when they know it's safe.
On architectures that don't fully support WC, e.g., x86 without
PAT, drivers for legacy framebuffers may get some of the benefit
by using arch_phys_wc_add() in addition to pci_iomap_wc(). But
arch_phys_wc_add() is unreliable and should be avoided in
general. On x86, it uses MTRRs, which are limited in number and
size, so the results will vary based on driver loading order.
The goals of adding pci_iomap_wc() are to:
- Give drivers an architecture-independent way to use WC so they can stop
using interfaces like mtrr_add() (on x86, pci_iomap_wc() uses
PAT when available).
- Move toward using _PAGE_CACHE_MODE_UC, not _PAGE_CACHE_MODE_UC_MINUS,
on x86 on ioremap_nocache() (see de33c442ed ("x86 PAT: fix
performance drop for glx, use UC minus for ioremap(), ioremap_nocache()
and pci_mmap_page_range()").
Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com>
[ Move IORESOURCE_IO check up, space out statements for better readability. ]
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: <roger.pau@citrix.com>
Cc: <syrjala@sci.fi>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Davidlohr Bueso <dbueso@suse.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Roger Pau Monné <roger.pau@citrix.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Stefan Bader <stefan.bader@canonical.com>
Cc: Suresh Siddha <sbsiddha@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Toshi Kani <toshi.kani@hp.com>
Cc: Ville Syrjälä <syrjala@sci.fi>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: airlied@linux.ie
Cc: benh@kernel.crashing.org
Cc: dan.j.williams@intel.com
Cc: david.vrabel@citrix.com
Cc: jbeulich@suse.com
Cc: konrad.wilk@oracle.com
Cc: linux-arch@vger.kernel.org
Cc: linux-fbdev@vger.kernel.org
Cc: linux-pci@vger.kernel.org
Cc: venkatesh.pallipadi@intel.com
Cc: vinod.koul@intel.com
Cc: xen-devel@lists.xensource.com
Link: http://lkml.kernel.org/r/1440443613-13696-6-git-send-email-mcgrof@do-not-panic.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
59 lines
2 KiB
C
59 lines
2 KiB
C
/* Generic I/O port emulation, based on MN10300 code
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef __ASM_GENERIC_PCI_IOMAP_H
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#define __ASM_GENERIC_PCI_IOMAP_H
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struct pci_dev;
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#ifdef CONFIG_PCI
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/* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
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extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
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extern void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long max);
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extern void __iomem *pci_iomap_range(struct pci_dev *dev, int bar,
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unsigned long offset,
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unsigned long maxlen);
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extern void __iomem *pci_iomap_wc_range(struct pci_dev *dev, int bar,
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unsigned long offset,
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unsigned long maxlen);
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/* Create a virtual mapping cookie for a port on a given PCI device.
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* Do not call this directly, it exists to make it easier for architectures
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* to override */
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#ifdef CONFIG_NO_GENERIC_PCI_IOPORT_MAP
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extern void __iomem *__pci_ioport_map(struct pci_dev *dev, unsigned long port,
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unsigned int nr);
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#else
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#define __pci_ioport_map(dev, port, nr) ioport_map((port), (nr))
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#endif
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#elif defined(CONFIG_GENERIC_PCI_IOMAP)
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static inline void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max)
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{
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return NULL;
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}
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static inline void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long max)
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{
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return NULL;
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}
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static inline void __iomem *pci_iomap_range(struct pci_dev *dev, int bar,
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unsigned long offset,
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unsigned long maxlen)
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{
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return NULL;
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}
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static inline void __iomem *pci_iomap_wc_range(struct pci_dev *dev, int bar,
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unsigned long offset,
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unsigned long maxlen)
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{
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return NULL;
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}
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#endif
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#endif /* __ASM_GENERIC_IO_H */
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